ch16.2

cmd/api/errors.go

@@ -56,3 +56,8 @@ func (app *application) rateLimitExceededResponse(w http.ResponseWriter, r *http
 	message := "rate limit exceeded"
 	app.errorResponse(w, r, http.StatusTooManyRequests, message)
 }
+
+func (app *application) invalidCredentialsResponse(w http.ResponseWriter, r *http.Request) {
+	message := "invalid authentication credentials"
+	app.errorResponse(w, r, http.StatusUnauthorized, message)
+}

cmd/api/routes.go

@@ -23,5 +23,7 @@ func (app *application) routes() http.Handler {
 	router.HandlerFunc(http.MethodPost, "/v1/users", app.registerUserHandler)
 	router.HandlerFunc(http.MethodPut, "/v1/users/activated", app.activateUserHandler)
 
+	router.HandlerFunc(http.MethodPost, "/v1/tokens/authentication", app.createAuthenticationTokenHandler)
+
 	return app.recoverPanic(app.rateLimit(router))
 }

cmd/api/tokens.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"errors"
+	"net/http"
+	"time"
+
+	"gitea.local.lab/Lbenedar/greenlight/internal/data"
+	"gitea.local.lab/Lbenedar/greenlight/internal/validator"
+)
+
+func (app *application) createAuthenticationTokenHandler(w http.ResponseWriter, r *http.Request) {
+	var input struct {
+		Email    string `json:"email"`
+		Password string `json:"password"`
+	}
+
+	err := app.readJSON(w, r, &input)
+	if err != nil {
+		app.badRequestResponse(w, r, err)
+		return
+	}
+
+	v := validator.New()
+
+	data.ValidateEmail(v, input.Email)
+	data.ValidatePasswordPlaintext(v, input.Password)
+
+	if !v.Valid() {
+		app.failedValidationResponse(w, r, v.Errors)
+		return
+	}
+
+	user, err := app.models.Users.GetByEmail(input.Email)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrRecordNotFound):
+			app.invalidCredentialsResponse(w, r)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
+	}
+
+	match, err := user.Password.Matches(input.Password)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+		return
+	}
+
+	if !match {
+		app.invalidCredentialsResponse(w, r)
+		return
+	}
+
+	token, err := app.models.Tokens.New(user.ID, 24*time.Hour, data.ScopeAuthentication)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+		return
+	}
+
+	err = app.writeJSON(w, http.StatusCreated, envelope{"authentication_token": token}, nil)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+	}
+}

internal/data/tokens.go

@@ -12,15 +12,16 @@ import (
 )
 
 const (
-	ScopeActivation = "activation"
+	ScopeActivation     = "activation"
+	ScopeAuthentication = "authentication"
 )
 
 type Token struct {
-	Plaintext string
-	Hash      []byte
-	UserID    int64
-	Expiry    time.Time
-	Scope     string
+	Plaintext string    `json:"token"`
+	Hash      []byte    `json:"-"`
+	UserID    int64     `json:"-"`
+	Expiry    time.Time `json:"expiry"`
+	Scope     string    `json:"-"`
 }
 
 func generateToken(userID int64, ttl time.Duration, scope string) (*Token, error) {
@@ -66,7 +67,7 @@ func (m TokenModel) New(userID int64, ttl time.Duration, scope string) (*Token,
 
 func (m TokenModel) Insert(token *Token) error {
 	query := `
-		INSERT INTO tokens (hash, user_id, expirt, scope)
+		INSERT INTO tokens (hash, user_id, expiry, scope)
 		VALUES ($1, $2, $3, $4)`
 
 	args := []any{token.Hash, token.UserID, token.Expiry, token.Scope}

migrations/000005_create_tokens_table.up.sql

@@ -1,6 +1,6 @@
-CREATE TABLE IF NOT EXISTS tokens {
+CREATE TABLE IF NOT EXISTS tokens (
     hash bytea PRIMARY KEY,
     user_id bigint NOT NULL REFERENCES users ON DELETE CASCADE,
     expiry timestamp(0) with time zone NOT NULL,
     scope text NOT NULL
-};
+);